TLF50281EL

概要

The TLF50281EL is a high frequency PWM step-down DC/DC converter with an integrated PMOS power switch, packaged in a small PG-SSOP-14 with exposed pad. The wide input voltage range from 4.75 to 45 V makes the TLF50281EL suitable for a wide variety of applications. The device is designed to be used under harsh automotive environmental conditions. The switching frequency of nominal 2.2 MHz allows the use of small and cost-effective inductors and capacitors, resulting in a low, predictable output voltage ripple and in minimized consumption of board space. In light load condition the device operates in Pulse Frequency Modulation (PFM) to optimize the efficiency. Between the single pulses, all internal controlling circuitry is switched off to reduce the internal power consumption. The voltage regulation loop provides an excellent line and load regulation, the stability of the loop is ensured by an internal compensation network. This compensation network combined with a current mode regulation control guarantees a highly effective line transient rejection. During start-up the integrated soft-start limits the in rush current peak and prevents from an output voltage overshoot. The TLF50281EL includes protection features such as a cycle-by-cycle current limitation, over-temperature shutdown and input under voltage lockout. The enable function, in shutdown mode with less than 2 μA current consumption, enables easy power management in battery-powered systems. In addition, the TLF50281EL is providing a reset output with adjustable threshold and a timeout watchdog with adjustable timing to monitor and control the µC.

特長:

500 mA step down voltage regulator

5 V Output voltage

± 2% output voltage tolerance

Low quiescent current (less than 45μA at nominal battery voltage)

Current mode PWM regulation

PFM mode for light load current

Input voltage range from 4.75V to 45V

Integrated power transistor

2.2 MHz switching frequency

100% Duty cycle

Synchronization input

Very low shutdown current consumption (<2 μA)

Integrated compensation

Integrated soft-start function

Reset generator with adjustable threshold

Watchdog with adjustable timing

Input undervoltage lockout

Suited for automotive applications: Tj = -40 °C to +150 °C

Green Product (RoHS compliant)

AEC Qualified

利点:

Low current consumption for permanently Vbat-connnected systems

High switching frequency reduces value and size of coil and output capacitor